P0748 Pressure Control Solenoid Electrical

Definition: The P0748 code indicates a problem with the electrical circuit of the pressure control solenoid in an automatic transmission. This solenoid is responsible for regulating hydraulic pressure to ensure smooth gear shifts.

P0748 – Pressure Control Solenoid Electrical

Severity: Moderate

Common Causes

P0748 – Pressure Control Solenoid Electrical

Common causes:

• Faulty pressure control solenoid
• Open or short in the wiring harness connected to the pressure control solenoid
• Corroded or loose electrical connectors related to the pressure control solenoid
• Low transmission fluid level or dirty transmission fluid
• Internal transmission issues

Common Misdiagnosis

OBD2 Code: P0748

Description: Pressure Control Solenoid Electrical

Common Misdiagnosis: Replacing the pressure control solenoid without checking for wiring issues or a faulty transmission control module (TCM).

Common Diagnostic Steps

OBD2 Code: P0748

Description: Pressure Control Solenoid Electrical

• Check the transmission fluid level and condition. Ensure it is at the correct level and not contaminated.
• Inspect the wiring and connectors to the pressure control solenoid for any signs of damage, corrosion, or disconnection.
• Use a multimeter to test the voltage and ground signals at the solenoid connector. Compare readings with manufacturer specifications.
• Test the resistance of the pressure control solenoid using an ohmmeter. Verify that it falls within specified range provided by vehicle’s service manual.
• Examine related fuses and relays for continuity and proper operation.
• If equipped, use a scan tool to perform an active test on the pressure control solenoid to verify its operation.
• Check for any additional trouble codes that may indicate other issues affecting transmission performance.
• If all electrical tests pass, consider mechanical inspection of internal transmission components if necessary.